build fix (part of r59673, r59656)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59676 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/datetimefmt.cpp

@@ -1183,12 +1183,13 @@ wxDateTime::ParseFormat(const wxString& date,
             case _T('c'):       // locale default date and time  representation
                 {
                     wxDateTime dt;
-                    tm tm;
 
                     const wxString inc(input);
 
                     // NOTE: %c is locale-dependent; try strptime
 #ifdef HAVE_STRPTIME
+                    struct tm tm;
+
                     // try using strptime() -- it may fail even if the input is
                     // correct but the date is out of range, so we will fall back
                     // to our generic code anyhow